4 files changed, 116 insertions, 0 deletions

diff --git a/kernel/CMakeLists.txt b/kernel/CMakeLists.txt
index eb762ac..cadc373 100644
--- a/kernel/CMakeLists.txt
+++ b/kernel/CMakeLists.txt
@@ -2,6 +2,8 @@ add_executable("kernel"
     # Platform-independent KAPI implementation
     "kapi/boot_modules.cpp"
     "kapi/cio.cpp"
+    "kapi/cpu.cpp"
+    "kapi/interrupts.cpp"
     "kapi/memory.cpp"
     "kapi/system.cpp"
 
@@ -60,6 +62,15 @@ set_property(TARGET "kernel"
     "${KERNEL_LINKER_SCRIPT}"
 )
 
+file(GLOB_RECURSE KERNEL_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} "include/**.hpp")
+
+target_sources("kernel" PUBLIC
+    FILE_SET HEADERS
+    BASE_DIRS "include"
+    FILES
+    ${KERNEL_HEADERS}
+)
+
 target_disassemble("kernel")
 target_extract_debug_symbols("kernel")
 target_strip("kernel")
diff --git a/kernel/kapi/cpu.cpp b/kernel/kapi/cpu.cpp
new file mode 100644
index 0000000..13de584
--- /dev/null
+++ b/kernel/kapi/cpu.cpp
@@ -0,0 +1,35 @@
+#include "kapi/cpu.hpp"
+
+#include "kapi/system.hpp"
+
+#include <kstd/print>
+
+namespace kapi::cpu
+{
+
+  namespace
+  {
+    auto handle_page_fault(kapi::cpu::exception const & context) -> bool
+    {
+      kstd::println(kstd::print_sink::stderr, "\tFault address: {:#018x}", context.access_address);
+      kstd::println(kstd::print_sink::stderr, "\tPresent: {}", context.is_present);
+      kstd::println(kstd::print_sink::stderr, "\tWrite: {}", context.is_write_access);
+      kstd::println(kstd::print_sink::stderr, "\tUser: {}", context.is_user_mode);
+
+      kapi::system::panic("Halting the system due to an unrecoverable page fault.");
+    }
+  }  // namespace
+
+  auto dispatch(exception const & context) -> bool
+  {
+    kstd::println(kstd::print_sink::stderr, "[OS:CPU] {} @ {:#018x}", context.type, context.instruction_pointer);
+    switch (context.type)
+    {
+      case kapi::cpu::exception::type::page_fault:
+        return handle_page_fault(context);
+      default:
+        return false;
+    }
+  }
+
+}  // namespace kapi::cpu
\ No newline at end of file
diff --git a/kernel/kapi/interrupts.cpp b/kernel/kapi/interrupts.cpp
new file mode 100644
index 0000000..0e37bc3
--- /dev/null
+++ b/kernel/kapi/interrupts.cpp
@@ -0,0 +1,65 @@
+#include "kapi/interrupts.hpp"
+
+#include <kstd/flat_map>
+#include <kstd/print>
+#include <kstd/vector>
+
+#include <algorithm>
+#include <cstdint>
+
+namespace kapi::interrupts
+{
+
+  namespace
+  {
+    auto constinit handlers = kstd::flat_map<std::uint32_t, kstd::vector<handler *>>{};
+  }  // namespace
+
+  auto register_handler(std::uint32_t irq_number, handler & handler) -> void
+  {
+    if (handlers.contains(irq_number))
+    {
+      auto & handler_list = handlers.at(irq_number);
+      handler_list.push_back(&handler);
+    }
+    else
+    {
+      handlers.emplace(irq_number, kstd::vector{&handler});
+    }
+  }
+
+  auto unregister_handler(std::uint32_t irq_number, handler & handler) -> void
+  {
+    auto & handler_list = handlers.at(irq_number);
+    auto [first, last] = std::ranges::remove(handler_list, &handler);
+    handler_list.erase(first, last);
+  }
+
+  auto dispatch(std::uint32_t irq_number) -> status
+  {
+    if (!handlers.contains(irq_number))
+    {
+      kstd::println(kstd::print_sink::stderr, "[OS:interrupts] No handler for IRQ{}", irq_number);
+      return status::unhandled;
+    }
+
+    auto & handler_list = handlers.at(irq_number);
+
+    if (handler_list.empty())
+    {
+      kstd::println(kstd::print_sink::stderr, "[OS:interrupts] No handler for IRQ{}", irq_number);
+      return status::unhandled;
+    }
+
+    for (auto handler : handler_list)
+    {
+      if (handler && handler->handle_interrupt(irq_number) == status::handled)
+      {
+        return status::handled;
+      }
+    }
+
+    return status::unhandled;
+  }
+
+}  // namespace kapi::interrupts
\ No newline at end of file
diff --git a/kernel/src/main.cpp b/kernel/src/main.cpp
index 98c88f2..bb6d57d 100644
--- a/kernel/src/main.cpp
+++ b/kernel/src/main.cpp
@@ -1,5 +1,7 @@
 #include "kapi/boot_modules.hpp"
 #include "kapi/cio.hpp"
+#include "kapi/cpu.hpp"
+#include "kapi/interrupts.hpp"
 #include "kapi/memory.hpp"
 #include "kapi/system.hpp"
 
@@ -169,6 +171,9 @@ auto main() -> int
   kapi::cio::init();
   kstd::println("[OS] IO subsystem initialized.");
 
+  kapi::cpu::init();
+  kapi::interrupts::enable();
+
   kapi::memory::init();
   kernel::memory::init_heap(kapi::memory::heap_base);
   kstd::println("[OS] Memory subsystem initialized.");